02-09-2008 09:46 PM - edited 03-13-2019 04:57 PM
hello,
is it possible to have an ip phone on the remote thru the wan if iam having call manager express on the head office..
thanks
02-10-2008 03:12 AM
Yes, it's absolutely possible.
You can use either g729 or default g711 codec, depending on you wan situation.
Hope this helps! Please rate post if it does!
02-10-2008 03:39 AM
but isnt it that registration is thru sccp
02-10-2008 04:12 AM
Yes, sccp works over tcp and is routable just like any other ip packet.
Please remember to rate useful posts with the scrollbox below!
02-10-2008 05:33 AM
Any sample config please.
thanks
02-10-2008 09:51 AM
Really no special config is needed. If you don't have IP connectivity between the remote phone and the voice vlan, under ephone configure 'mtp". If you want codec g729, do configure that.
Nothing else is required.
As an appreciation to those providing answers, please rate useful posts with the scrollbox below!
02-12-2008 01:56 PM
Here is a working config fro a remote phone registering on a local CME and using G729.
You will need an IOS that runs CME version 4.1 to use the G729 option under the ephone. You also need to set up transcoding to allow the remote phone to interwork with the local devices which will be using G711.
MAC addresses and IP addresses will obviously have to be altered.
!
sccp local GigabitEthernet0/0
sccp ccm 172.19.150.56 identifier 1
sccp
!
sccp ccm group 1
associate ccm 1 priority 1
associate profile 1 register MTP0013c49a0cd0
keepalive retries 5
!
dspfarm profile 1 transcode
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
codec gsmfr
codec g729r8
maximum sessions 90
associate application SCCP
no shutdown
!
telephony-service
load 7960-7940 P00307020300
max-ephones 100
max-dn 300
ip source-address 172.19.150.56 port 2000
system message Test System CCME 4.1
sdspfarm units 1
sdspfarm transcode sessions 128
sdspfarm tag 1 MTP0013c49a0cd0
voicemail 7800
max-conferences 24 gain -6
call-forward pattern .T
moh music-on-hold.au
multicast moh 239.1.1.1 port 2000
web admin system name admin password cisco
transfer-system full-consult
transfer-pattern .T
secondary-dialtone 9
create cnf-files version-stamp Jan 01 2002 00:00:00
!
!
!
ephone-dn 2
number 6002
call-forward busy 7800
call-forward noan 7800 timeout 10
!
!
!
ephone-dn 5 dual-line
number 6005
call-forward busy 7800
call-forward noan 7800 timeout 10
!
!
ephone 5
device-security-mode none
username "Dweezil"
mac-address 0011.5C0E.571B
paging-dn 99 unicast
! Paging should be set to unicast if multicast-routing is not enabled on WAN:
codec g729r8 dspfarm-assist
mtp
type 7970
button 1:5 2:2
02-22-2008 12:18 AM
i just found the document that relates with this issue. the doc is from the
IPTX ver4. vol 1
Cisco Training and Certification notes which states;
"Registrayion accross the wan is not supported. The ip phones must be on the local LAN with the cisco unified call manager express router'
02-22-2008 03:36 AM
sorry forgot to put the page numbers
IPTX ver4. vol 1
page 1-9
Cisco Training and Certification
02-22-2008 04:40 AM
Hi, that is old and wrong informatio, should be corrected.
Here the cme manual about remote phones:
http://cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmebasic.html#wp1061320
Hope this helps, please rate post if it does!
02-22-2008 05:10 AM
on one part of the link it says the following but isnt it that cme DOESNT support CAC?
----------------------------------------
SCCP: Enabling a Remote Phone
To enable IP phones or instances of Cisco IP Communicator to connect to a Cisco Unified CME system over a WAN, perform the following steps.
Prerequisites
â¢The WAN link supporting remote teleworker phones should be configured with a Call Admission Control (CAC) or Resource Reservation Protocol (RSVP) solution to prevent the oversubscription of bandwidth, which can degrade the quality of all voice calls.
02-22-2008 06:19 AM
CME has no concept of a remote region. Even though you can register phones remotely using the configs I posted earlier, it still assumes all phones are local and it has no awareness of any form of call admission control (CAC). So if you have bandwidth limitations, CME won't perform any form of bandwidth reservation or alternate rerouting. The best suggestion here would be to set up a LLQ class that gives absolute priority for the sccp and rtp traffic, and ensure that there is no chance of the link being oversubscribed by too many remote devices.
02-25-2008 09:59 PM
but in this case we cannot control the max number of calls traversing the wan
02-26-2008 01:33 PM
I think the documentation part about cac and rsvp is misleading, and Paul's advice is correct.
However to limit calls for a remote cme phone is easy, as you control the number of lines you give to it.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide